Been gathering some parts to get my amp power supply together.
Mine is basically an SB-220 transformer set up for 230v and the secondary will
run about 2700v at 500-600 mA.
I have a few questions regarding a step-start (soft-start?) in the primary
leads.
1. Should there be a step-start resistor in both primary legs or is just one
leg adequate?
2. Some sample circuits show the step-start relay across one side of the mains
supply (120vac) with an electrolytic across the coil, a series pot for
adjusting time delay, and a series diode. Now some samples indicate a 120vac
coil and others a 120vdc coil. It seems to me the diode and pot provide enough
rectification and smoothing to go with a dc coil here.
3. Am I assuming correctly that only a couple seconds of delay are needed and
that the typical 25 or 50 watt resistors are an adequate rating for this short
delay?
Steve KK7UV
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